Acoustic fields and microfluidic patterning around embedded micro-structures subject to surface acoustic waves
Name
Manuscript Accepted.pdf
Description
Accepted version
Size
1.65 MB
Format
Adobe PDF
Checksum (MD5)
3955658a49fbe0917f793877cab6b6b1
Author(s)
Collins, David J.
O’Rorke, Richard
Neild, Adrian
Han, Jongyoon
Ai, Ye
Date Issued
October 2019
Journal
Soft matter
Publisher
Royal Society of Chemistry (RSC)
Citation
Collins, David J., et al. "Acoustic fields and microfluidic patterning around embedded micro-structures subject to surface acoustic waves." Soft Matter, 15, 43 (November 2019): 8691-8705
© 2019 Royal Society of Chemistry
Version
Author's final manuscript
Abstract
Recent research has shown that interactions between acoustic waves and microfluidic channels can generate microscale interference patterns with the application of a traveling surface acoustic wave (SAW), effectively creating standing wave patterns with a traveling wave. Forces arising from this interference can be utilized for precise manipulation of micron-sized particles and biological cells. The patterns that have been produced with this method, however, have been limited to straight lines and grids from flat channel walls, and where the spacing resulting from this interference has not previously been comprehensively explored. In this work we examine the interaction between both straight and curved channel interfaces with a SAW to derive geometrically deduced analytical models. These models predict the acoustic force-field periodicity near a channel interface as a function of its orientation to an underlying SAW, and are validated with experimental and simulation results. Notably, the spacing is larger for flat walls than for curved ones and is dependent on the ratio of sound speeds in the substrate and fluid. Generating these force-field gradients with only travelling waves has wide applications in acoustofluidic systems, where channel interfaces can potentially support a range of patterning, concentration, focusing and separation activities by creating locally defined acoustic forces.
MIT Department
Massachusetts Institute of Technology. Department of Biological Engineering
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/10.1039/c9sm00946a
